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using System;
using System.Collections.Generic;
using System.Text;
using System.Web;
using System.Threading;
using System.Globalization;
namespace Pfizer.WPO.Belgium.Architecture.ExtranetUtilities.HttpModules
{
public class LanguageModule : IHttpModule
{
private const string LANGUAGE_COOKIE = "Language";
private const string LANGUAGE_KEY = "Language";
private static string[] VALID_LANGUAGES = { "en", "fr", "nl" };
#region IHttpModule Members
public void Dispose()
{
}
public void Init(HttpApplication context)
{
context.BeginRequest += new EventHandler(context_BeginRequest);
}
#endregion
void context_BeginRequest(object sender, EventArgs e)
{
// Check if a language is set in the query string (case we come from a partner site)
string queryStringLanguage = HttpContext.Current.Request.QueryString[LANGUAGE_KEY];
if (!String.IsNullOrEmpty(queryStringLanguage))
{
if (SetLanguage(queryStringLanguage))
{
return;
}
}
// Check if a language is set in a preference cookie
HttpCookie languageCookie = HttpContext.Current.Request.Cookies.Get(LANGUAGE_COOKIE);
if (languageCookie != null)
{
if (SetLanguage(languageCookie[LANGUAGE_KEY]))
{
return;
}
}
// Get browser sent language preferences
if ((HttpContext.Current.Request.UserLanguages != null) && (HttpContext.Current.Request.UserLanguages.Length > 0))
{
if (SetLanguage(HttpContext.Current.Request.UserLanguages[0].Substring(0, 2)))
{
return;
}
}
// Fallback to default
SetLanguage("en");
}
private static bool SetLanguage(string language)
{
return SetLanguage(language, false);
}
private static bool SetLanguage(string language, bool savePreference)
{
bool result = false;
// Verify if language is one of the valid ones
if (Array.Exists<string>(VALID_LANGUAGES, delegate(string valid)
{
return String.Compare(language, valid, true) == 0;
}))
{
if (savePreference)
{
HttpCookie cookie = new HttpCookie(LANGUAGE_COOKIE);
cookie.Values[LANGUAGE_KEY] = language;
cookie.Expires = DateTime.MaxValue;
HttpContext.Current.Response.Cookies.Add(cookie);
}
CultureInfo culture = GetCultureInfo(language);
Thread.CurrentThread.CurrentCulture = culture;
Thread.CurrentThread.CurrentUICulture = culture;
result = true;
}
return result;
}
public static CultureInfo GetCultureInfo(string language)
{
switch (language.ToLower())
{
case "en":
return new CultureInfo("en-US");
case "fr":
return new CultureInfo("fr-BE");
case "nl":
return new CultureInfo("nl-BE");
default:
return CultureInfo.InvariantCulture;
}
}
public static void ChangeLanguage(string language)
{
if (SetLanguage(language, true))
{
HttpContext.Current.Response.Redirect(HttpContext.Current.Request.FilePath);
}
}
}
} |
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